Breathing through your mouth is not respiration (the key to life and health).
Mouthbreathing can cause the following problems:
Decreased pH during sleep = increased decay and erosion
Enlarged tonsils and adenoids
Tongue thrust and open bite/speech problems
Abnormal swallowing pattern/malocclusion
Abnormal arch development
Weak, flaccid lips
Low energy levels
High Stress levels
Addiction to chapstick/lipgloss
Chewing with mouth open
Why do I mouth breathe?
Nasal septum deviation